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3r/4+9=5r-144
We move all terms to the left:
3r/4+9-(5r-144)=0
We get rid of parentheses
3r/4-5r+144+9=0
We multiply all the terms by the denominator
3r-5r*4+144*4+9*4=0
We add all the numbers together, and all the variables
3r-5r*4+612=0
Wy multiply elements
3r-20r+612=0
We add all the numbers together, and all the variables
-17r+612=0
We move all terms containing r to the left, all other terms to the right
-17r=-612
r=-612/-17
r=+36
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